package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.LoggingEvent;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author : xyiaao
 * @createDate : 2022/1/28 16:07
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    /**
     * 路径匹配器，支持通配符
     */
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        long id = Thread.currentThread().getId();
        log.info("线程id：{}", id);

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 获取本次请求
        String uri = request.getRequestURI();
        log.info("拦截到请求：{}", uri);

        // 定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        LoggingEvent loggingEvent = new LoggingEvent();
        loggingEvent.setUri(uri);
        // 获取用户ip并保存
        loggingEvent.setIp(request.getRemoteAddr());

        // 判断本次请求是否需要处理
        boolean check = check(urls, uri);

        // 如果不需要处理直接放行
        if (check) {
            log.info("本次请求{}不需要处理", uri);
            BaseContext.setLoggingEvent(loggingEvent);
            filterChain.doFilter(request, response);
            return;
        }

        // 判断员工登录状态，如果已登录，则直接放行
        Long employee = (Long) request.getSession().getAttribute("employee");
        if (employee != null) {
            log.info("用户已登录，用户id为：{}", employee);
            BaseContext.setCurrentId(employee);
            loggingEvent.setEmployeeId(employee);
            BaseContext.setLoggingEvent(loggingEvent);
            filterChain.doFilter(request, response);
            return;
        }

        // 判断用户登录状态
        Long user = (Long) request.getSession().getAttribute("user");
        if (user != null) {
            log.info("用户已登录，用户id为：{}", user);
            BaseContext.setCurrentId(user);
            loggingEvent.setUserId(user);
            BaseContext.setLoggingEvent(loggingEvent);
            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");

        // 如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    private boolean isLogin(HttpServletRequest request, String str, FilterChain filterChain, HttpServletResponse response) throws IOException, ServletException {

        Object login = request.getSession().getAttribute(str);
        if (login != null) {
            log.info("用户已登录，用户id为：{}", login);
            BaseContext.setCurrentId((Long) login);
            filterChain.doFilter(request, response);
            return true;
        }
        return false;
    }


    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param urls
     * @param uri
     * @return
     */
    private boolean check(String[] urls, String uri) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, uri)) {
                return true;
            }
        }
        return false;
    }


    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }


    @Override
    public void destroy() {
        Filter.super.destroy();
    }

}
